Propeller noise caused by blade tip radial forcesNew experimental evidence which indicates the presence of leading edge and tip edge vortex flow on Prop-Fans is examined, and performance and noise consequences are addressed. It was shown that the tip edge vortex is a significant noise source, particularly for unswept Prop-Fan blades. Preliminary calculations revealed that the addition of the tip side edge source to single rotation Prop-Fans during take off conditions improved the agreement between experiment and theory at blade passing frequency. At high-speed conditions such as the Prop-Fan cruise point, the tip loading effect tends to cancel thickness noise.
Document ID
19860060766
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hanson, D. B. (United Technologies Corp. Hamilton Standard Div., Windsor Locks, CT, United States)